-21.56% is the change from 668 to 524
Calculation steps:
[( 524 - 668 ) ÷ 668] x 100 = -21.56%
Formula
Percentage change = [(524 - 668) / 668] x 100
Subtract the new number by the original number
524 - 668 = -144
-144 ÷ 668 = -0.2155688622754491
-0.2155688622754491 x 100 = -21.56%